diff --git a/activitysim/abm/models/joint_tour_frequency.py b/activitysim/abm/models/joint_tour_frequency.py
index a79a9399c..e5ec61601 100644
--- a/activitysim/abm/models/joint_tour_frequency.py
+++ b/activitysim/abm/models/joint_tour_frequency.py
@@ -73,7 +73,7 @@ def joint_tour_frequency(
     )
 
     # - preprocessor
-    preprocessor_settings = model_settings.get("preprocessor", None)
+    preprocessor_settings = model_settings.preprocessor
     if preprocessor_settings:
         locals_dict = {
             "persons": persons,
diff --git a/activitysim/abm/models/location_choice.py b/activitysim/abm/models/location_choice.py
index 380836e23..937721c05 100644
--- a/activitysim/abm/models/location_choice.py
+++ b/activitysim/abm/models/location_choice.py
@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 import logging
-from typing import Literal
 
 import numpy as np
 import pandas as pd
@@ -12,7 +11,10 @@
 from activitysim.abm.models.util import tour_destination
 from activitysim.abm.tables import shadow_pricing
 from activitysim.core import estimation, expressions, los, simulate, tracing, workflow
-from activitysim.core.configuration.logit import TourLocationComponentSettings
+from activitysim.core.configuration.logit import (
+    TourLocationComponentSettings,
+    TourModeComponentSettings,
+)
 from activitysim.core.interaction_sample import interaction_sample
 from activitysim.core.interaction_sample_simulate import interaction_sample_simulate
 
@@ -519,8 +521,10 @@ def run_location_logsums(
 
     assert not location_sample_df.empty
 
-    logsum_settings = state.filesystem.read_model_settings(
-        model_settings.LOGSUM_SETTINGS
+    logsum_settings = TourModeComponentSettings.read_settings_file(
+        state.filesystem,
+        str(model_settings.LOGSUM_SETTINGS),
+        mandatory=False,
     )
 
     # FIXME - MEMORY HACK - only include columns actually used in spec
diff --git a/activitysim/abm/models/util/logsums.py b/activitysim/abm/models/util/logsums.py
index dc5d543c0..b92045fa8 100644
--- a/activitysim/abm/models/util/logsums.py
+++ b/activitysim/abm/models/util/logsums.py
@@ -8,13 +8,16 @@
 
 from activitysim.core import config, expressions, los, simulate, tracing, workflow
 from activitysim.core.configuration import PydanticBase
-from activitysim.core.configuration.logit import TourLocationComponentSettings
+from activitysim.core.configuration.logit import (
+    TourLocationComponentSettings,
+    TourModeComponentSettings,
+)
 
 logger = logging.getLogger(__name__)
 
 
 def filter_chooser_columns(
-    choosers, logsum_settings, model_settings: dict | PydanticBase
+    choosers, logsum_settings: dict | PydanticBase, model_settings: dict | PydanticBase
 ):
     try:
         chooser_columns = logsum_settings.LOGSUM_CHOOSER_COLUMNS
@@ -52,7 +55,7 @@ def compute_location_choice_logsums(
     state: workflow.State,
     choosers: pd.DataFrame,
     tour_purpose,
-    logsum_settings,
+    logsum_settings: TourModeComponentSettings,
     model_settings: TourLocationComponentSettings,
     network_los: los.Network_LOS,
     chunk_size: int,
@@ -68,8 +71,8 @@ def compute_location_choice_logsums(
     ----------
     choosers
     tour_purpose
-    logsum_settings
-    model_settings
+    logsum_settings : TourModeComponentSettings
+    model_settings : TourLocationComponentSettings
     network_los
     chunk_size
     trace_hh_id
@@ -82,6 +85,8 @@ def compute_location_choice_logsums(
     """
     if isinstance(model_settings, dict):
         model_settings = TourLocationComponentSettings.parse_obj(model_settings)
+    if isinstance(logsum_settings, dict):
+        logsum_settings = TourModeComponentSettings.parse_obj(logsum_settings)
 
     trace_label = tracing.extend_trace_label(trace_label, "compute_logsums")
     logger.debug(f"Running compute_logsums with {choosers.shape[0]:d} choosers")
@@ -152,7 +157,7 @@ def compute_location_choice_logsums(
     else:
         logger.error("Choosers table already has column 'duration'.")
 
-    logsum_spec = state.filesystem.read_model_spec(file_name=logsum_settings["SPEC"])
+    logsum_spec = state.filesystem.read_model_spec(file_name=logsum_settings.SPEC)
     coefficients = state.filesystem.get_segment_coefficients(
         logsum_settings, tour_purpose
     )
@@ -223,7 +228,7 @@ def compute_location_choice_logsums(
         )
 
         # TVPB constants can appear in expressions
-        if logsum_settings.get("use_TVPB_constants", True):
+        if logsum_settings.use_TVPB_constants:
             locals_dict.update(
                 network_los.setting("TVPB_SETTINGS.tour_mode_choice.CONSTANTS")
             )
@@ -233,9 +238,7 @@ def compute_location_choice_logsums(
     # - run preprocessor to annotate choosers
     # allow specification of alternate preprocessor for nontour choosers
     preprocessor = model_settings.LOGSUM_PREPROCESSOR
-    preprocessor_settings = (
-        getattr(logsum_settings, preprocessor, None) or logsum_settings[preprocessor]
-    )
+    preprocessor_settings = getattr(logsum_settings, preprocessor, None)
 
     if preprocessor_settings:
         simulate.set_skim_wrapper_targets(choosers, skims)